Remembering Isaac Asimov
Not being a fan of fiction or lengthiness, my favorite Isaac Asimov books are his Opuses (Opus 100, Opus 200, and Opus 300). These were published to mark his 100th, 200th, and 300th books respectively. Each Opus contained excerpts from his most recent previous 99 books, both fiction and non-fiction. If you're like me or if you're looking for a gentle introduction to Asimov's highly influential writings, you could do a lot worse than picking up Opus 100.